CN108856744B - Machine tool tailstock with center driving and adjusting device - Google Patents
Machine tool tailstock with center driving and adjusting device Download PDFInfo
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- CN108856744B CN108856744B CN201810651827.7A CN201810651827A CN108856744B CN 108856744 B CN108856744 B CN 108856744B CN 201810651827 A CN201810651827 A CN 201810651827A CN 108856744 B CN108856744 B CN 108856744B
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- 230000000149 penetrating effect Effects 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 34
- 230000006872 improvement Effects 0.000 description 12
- 230000009471 action Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 239000011295 pitch Substances 0.000 description 5
- 230000013011 mating Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B23/00—Tailstocks; Centres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B33/00—Drivers; Driving centres, Nose clutches, e.g. lathe dogs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention provides a machine tool tailstock with a center driving and adjusting device, belongs to the technical field of machinery, and solves the problem that the existing tailstock is inconvenient to adjust. This take top drive adjusting device's lathe tailstock includes: the body is horizontally penetrated and provided with a mounting hole, one end of the mounting hole is covered with an end cover, the other end of the mounting hole is penetrated with a piston sleeve, a mandrel is movably arranged in the mounting hole, and the head end of the mandrel is embedded with a center; the first screw rod is movably arranged in the piston sleeve in a penetrating way, a first driving nut is sleeved on the first screw rod, the first screw rod extends out of the piston sleeve and is sleeved with a driving hand wheel, the first driving nut is connected with the mandrel through a spring, and the driving hand wheel can be rotated to drive the first screw rod to rotate so that the first driving nut moves towards the mandrel and pushes the mandrel and the center to move outwards through the spring; the second screw penetrates through the body, a scale hand wheel is sleeved at the top of the second screw, and the tip offset can be driven by rotating the scale hand wheel. The invention has the characteristic of convenient adjustment.
Description
Technical Field
The invention belongs to the technical field of machinery, and relates to a machine tool tailstock with a center driving and adjusting device.
Background
Rotary machine tools (e.g., grinding machines, lathes, etc.) typically incorporate a tailstock to position the workpiece, the tailstock being an important component to which is mounted a tip for supporting the workpiece against. In a grinding machine, a tailstock is usually arranged on one side of a workbench and is in sliding fit connection with the workbench, a spindle device is arranged on the other side of the workbench opposite to the tailstock, one end of a workpiece with a longer axial length is clamped through the spindle device, and the other end of the workpiece is propped against and supported by a center on the tailstock.
In actual production, a single manual lever or hydraulic driving mode is often adopted to drive the center, and for supporting light and small workpieces, the manual lever or hydraulic driving force is too large, so that certain power is wasted, and meanwhile, the workpieces are deformed due to excessive propping, so that the processing of the workpieces is not facilitated.
In addition, the center and the main shaft need to have strict coaxiality, and for different types of workpieces, the positioning of a common tailstock is often difficult to ensure accuracy, and the stability of coaxiality is difficult to ensure. In order to ensure that the center positions different workpieces accurately, an adjusting device is arranged on a tailstock to adjust the specific position of the center in production, but the adjusting structure form adopted on the existing machine tool is too complex, so that the assembly is difficult, and the use mode is also difficult to be executed by a single person.
In summary, in order to solve the structural defect of the existing machine tool tailstock, the invention designs the machine tool tailstock with the center driving and adjusting device, which is reasonable in design and convenient to adjust.
Disclosure of Invention
The invention provides a machine tool tailstock with a center driving and adjusting device, which is reasonable in design and convenient to adjust, and solves the problems in the prior art.
The aim of the invention can be achieved by the following technical scheme: a machine tool tailstock with a center drive adjustment device, comprising:
the body is clamped on the machine tool, a mounting hole is horizontally formed in the body in a penetrating mode, one end of the mounting hole is covered with an end cover, the other end of the mounting hole is provided with a piston sleeve in a penetrating mode, the piston sleeve is tightly attached to the mounting hole, a mandrel is movably arranged in the mounting hole, the head end of the mandrel is embedded with a center, the center extends out of the end cover, and the piston sleeve part extends into the tail end of the mandrel;
the first screw rod is movably arranged in the piston sleeve in a penetrating way, a first driving nut positioned in the piston sleeve is sleeved on the first screw rod, the first screw rod extends out of the piston sleeve and is sleeved with a driving hand wheel, the first driving nut is connected with the mandrel through a spring, and the driving hand wheel can be rotated to drive the first screw rod to rotate so that the first driving nut moves towards the mandrel and pushes the mandrel and the center to move outwards through the spring;
the second screw rod penetrates through the body from top to bottom, a scale hand wheel is sleeved at the top of the second screw rod, and the second screw rod can be driven to rotate by rotating the scale hand wheel, so that part of the body drives the center to deviate.
As a further improvement of the scheme, the head end of the mandrel is provided with a taper hole matched with the center, the tail end of the mandrel is provided with a step hole which is coaxially arranged with the taper hole and communicated with the taper hole, the step hole is provided with a first step surface and a second step surface, the second step surface is close to the piston sleeve, and the spring is abutted against the first step surface.
As a further improvement of the scheme, a push rod is arranged in the first screw in a penetrating way, the push rod is composed of a connecting part and a guiding part, the connecting part is positioned in the first screw, and the guiding part sequentially penetrates through the spring and the step hole and can partially extend into the taper hole.
As a further improvement of the scheme, the mounting hole comprises a matching part and an accommodating part, the matching part is connected with the accommodating part through a third step surface, the accommodating part is arranged close to the piston sleeve, a fourth step surface corresponding to the third step surface is arranged around the mandrel, and the mandrel can drive the center to move outwards until the fourth step surface abuts against the third step surface.
As a further improvement of the scheme, an oil outlet cavity is formed by surrounding between the mandrel and the accommodating part, an oil inlet cavity is formed by surrounding between the tail end of the mandrel and the piston sleeve, a first oil way communicated with the oil inlet cavity is formed on the piston sleeve, and a second oil way communicated with the oil outlet cavity is formed on the body.
As a further improvement of the scheme, a flat key is embedded on the side wall of the periphery of the first driving nut, a sliding groove which is arranged corresponding to the flat key is further formed in the inner wall of the piston sleeve, and the sliding groove penetrates through the piston sleeve.
As a further improvement of the scheme, a guide post extending into the matching part is embedded at the top of the body, a guide groove which is arranged corresponding to the guide post is formed in the side wall of the periphery of the mandrel, and the guide groove extends along the axial direction of the mandrel.
As a further improvement of the scheme, the through hole parallel to the mounting hole is further formed in the body in a penetrating mode, the through hole is located below the mounting hole, a notch extending along the axial direction of the through hole is formed in the side wall of the through hole, the notch horizontally penetrates through the body outwards to form a gap, the gap divides the body into an upper portion and a lower portion, and the second screw penetrates through the gap.
As a further improvement of the scheme, the body is provided with an adjusting hole in a penetrating mode in the vertical direction, the second screw rod is arranged in the adjusting hole in a penetrating mode, the adjusting hole is composed of an upper counter bore and a lower counter bore, the upper counter bore is located at the upper portion, and the lower counter bore is located at the lower portion.
As a further improvement of the scheme, a second driving nut is fixedly arranged at the top of the upper counter bore, a second driving nut part stretches into the upper counter bore, a supporting nut is embedded in the lower counter bore, the supporting nut stretches out downwards and is sleeved with a locking nut, the second screw penetrates through the second driving nut and partially stretches into the supporting nut, the second screw is in threaded connection with the second driving nut and the supporting nut respectively, and the second screw can be driven to move downwards until the scale hand wheel abuts against the second driving nut when the scale hand wheel is rotated.
As another improvement of the scheme, one side of the bottom of the body downwards extends to form a bearing edge, two symmetrically arranged threaded sleeves are embedded above the bearing edge, two locking bolts corresponding to the two threaded sleeves one by one are arranged on the other side of the bottom in a penetrating mode, movable wedges are sleeved on each locking bolt, and clamping spaces are formed between the movable wedges and the bearing edge in a surrounding mode.
As a further improvement, the head of the locking bolt is embedded into the corresponding threaded sleeve and is in threaded connection with the corresponding threaded sleeve, and the tail of the locking bolt is sleeved with a jacking sleeve which is abutted against the corresponding movable wedge block.
As a further improvement of the scheme, a plurality of air floatation holes are formed in the bottom of the body.
Compared with the prior art, the invention has reasonable structural design, and the center is selectively and properly driven in a manual driving and hydraulic driving way by the first screw, so that the invention can be suitable for positioning different products and has good adaptability; the second screw rod and the scale hand wheel cooperate to realize the fine adjustment function of the center position; in addition, the installation position of the body can be changed on the machine tool according to actual needs by the arrangement of the movable wedge blocks, so that the adjustment is convenient, and the flexibility is good.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the structure of fig. 1 from another view angle.
Fig. 3 is a schematic view of the structure of fig. 2 from another view angle.
Fig. 4 is a partial cross-sectional view of fig. 1.
Fig. 5 is a schematic view of the structure of another state of fig. 4.
Fig. 6 is a schematic view of the piston sleeve according to the present invention.
Fig. 7 is a partial cross-sectional view of fig. 2.
Fig. 8 is a partial cross-sectional view of fig. 3.
Fig. 9 is a trace of tip trimming in the present invention.
In the figure, 10, a body; 11. an upper part; 12. a lower part; 131. a mating portion; 132. a housing part; 133. a third step surface; 14. a through hole; 151. a counter bore is formed; 152. a lower counter bore; 161. a first oil passage; 162. a second oil path; 17. a guide post; 18. a bearing edge; 19. an air floatation hole; 21. a first screw; 22. driving a hand wheel; 23. a piston sleeve; 231. a chute; 24. a first drive nut; 241. a flat key; 25. a spring; 26. a push rod; 31. a second screw; 32. a scale hand wheel; 321. scale marks; 33. a support nut; 34. a second drive nut; 341. hole shoulders; 35. a lock nut; 36. a support base; 361. a scale pointer; 40. a mandrel; 41. taper holes; 42. a step hole; 421. a first step surface; 422. a second step surface; 431. a fourth step surface; 432. a guide groove; 51. an oil inlet cavity; 52. an oil outlet cavity; 61. a threaded sleeve; 62. a locking bolt; 621. a top cover; 63. a movable wedge; 70. a center; 80. a slit.
Detailed Description
The technical scheme of the invention is further described below with reference to the embodiment and the attached drawings.
As shown in fig. 1, 2, 4 and 7, the machine tool tailstock with the center drive adjustment device includes:
the body 10 is clamped on a machine tool, a mounting hole is horizontally formed in the body 10 in a penetrating mode, one end of the mounting hole is covered with an end cover, the other end of the mounting hole is provided with a piston sleeve 23 in a penetrating mode, the piston sleeve 23 is tightly attached to the mounting hole, a mandrel 40 is movably arranged in the mounting hole, the head end of the mandrel 40 is embedded with a tip 70, the tip 70 extends out of the end cover, and part of the piston sleeve 23 extends into the tail end of the mandrel 40;
the first screw rod 21 is movably arranged in the piston sleeve 23 in a penetrating way, a first driving nut 24 positioned in the piston sleeve 23 is sleeved on the first screw rod 21, the first screw rod 21 extends out of the piston sleeve 23 and is sleeved with a driving hand wheel 22, the first driving nut 24 is connected with the mandrel 40 through a spring 25, the driving hand wheel 22 is rotated to drive the first screw rod 21 to rotate so that the first driving nut 24 moves towards the mandrel 40, and the mandrel 40 and the center 70 are pushed to move outwards through the spring 25;
the second screw rod 31 penetrates through the body 10 from top to bottom, a scale hand wheel 32 is sleeved at the top of the second screw rod 31, and the second screw rod 31 can be driven to rotate by rotating the scale hand wheel 32, so that part of the body 10 drives the center 70 to deviate.
In actual production, a single manual lever or hydraulic driving mode is often adopted to drive the center 70, and for the support of light and small workpieces, certain power waste exists due to overlarge driving force, and meanwhile, the workpieces deform due to excessive propping, so that the processing of the workpieces is not facilitated.
In addition, the common tailstock is difficult to ensure accuracy in locating the center, the stability of coaxiality is difficult to ensure, the adjusting structural form adopted on the existing machine tool is too complex, assembly is difficult, and the use mode is also difficult to be executed by a single person.
Therefore, the invention designs the machine tool tailstock with the center driving and adjusting device, and the first screw 21 and the driving hand wheel 22 are matched, so that the driving and positioning are accurate, and various types of workpieces can be met; meanwhile, the second screw 31 and the scale hand wheel 32 cooperate to realize the fine adjustment function of the position of the center 70, thereby meeting the position requirement on workpiece positioning, being convenient for adjustment and having good flexibility.
Specifically, the installation hole is formed in the body 10 to facilitate the installation of the mandrel 40 and the piston sleeve 23 matched with the mandrel 40, the first screw rod 21 is arranged in the piston sleeve 23 in a penetrating manner and sleeved with the first driving nut 24, the driving hand wheel 22 is sleeved on the part of the first screw rod 21 penetrating out of the piston sleeve 23, the driving hand wheel 22 is rotated to drive the first screw rod 21 to rotate, the first driving nut 24 moves along the first screw rod 21, the mandrel 40 is further pushed to move outwards with the center 70 through the cooperation of the first driving nut 24 and the spring 25, so that the center 70 positions a workpiece, after the workpiece is machined, the driving hand wheel 22 is reversely rotated, and the mandrel 40 moves inwards under the rebound action of the spring 25 and the driving of the first driving nut 24.
As shown in fig. 4, 5 and 6, preferably, a taper hole 41 is formed at the head end of the mandrel 40 and is matched with the tip 70, a step hole 42 which is coaxially arranged with the taper hole 41 and is mutually communicated is formed at the tail end of the mandrel 40, the step hole 42 is provided with a first step surface 421 and a second step surface 422, the second step surface 422 is arranged close to the piston sleeve 23, and the spring 25 abuts against the first step surface 421.
In this embodiment, it is preferable that one side of the mandrel 40, which is close to the end cover, is the head end, the other end is the tail end, a taper hole 41 is formed in the head end of the mandrel 40 to embed the tip 70, so as to ensure that the tip 70 is tightly connected with the mandrel 40, and meanwhile, a step hole 42 is formed in the tail end of the mandrel 40, wherein the step hole 42 and the taper hole 41 are coaxially arranged and are mutually communicated, a first step surface 421 and a second step surface 422 are arranged in the step hole 42, preferably the second step surface 422 is arranged close to the piston sleeve 23, the mandrel 40 can be close to or far away from the piston sleeve 23 when moving in the mounting hole, and when the mandrel 40 is close to the piston sleeve 23, the piston sleeve 23 can be partially embedded into the step hole 42 until the piston sleeve 23 abuts against the second step surface 422.
Further, the ejector rod 26 is provided in the first screw 21 in a penetrating manner, the ejector rod 26 is composed of a connecting portion and a guiding portion, the connecting portion is located in the first screw 21, and the guiding portion sequentially passes through the spring 25 and the stepped hole 42 and can partially extend into the taper hole 41.
It is preferable that the ejector rod 26 is arranged in the first screw rod 21 in a penetrating way, the ejector rod 26 extends towards the mandrel 40 and penetrates through the step hole 42, when the first screw rod 21 drives the first driving nut 24 to act and pushes the mandrel 40 to move back and forth under the action of the spring 25, the ejector rod 26 can partially enter the taper hole 41 along the step hole 42, the first driving nut 24 moves along the first screw rod 21 in the process, the mandrel 40 and the spring 25 are provided with guiding functions by the ejector rod 26, and the spring 25 is ensured to drive the mandrel 40 to move stably, so that the center 70 is convenient for positioning a workpiece.
Preferably, the mounting hole includes a mating portion 131 and an accommodating portion 132, the mating portion 131 is connected with the accommodating portion 132 through a third step surface 133, the accommodating portion 132 is disposed near the piston sleeve 23, a fourth step surface 431 corresponding to the third step surface 133 is disposed around the mandrel 40, and the mandrel 40 can drive the center 70 to move outwards until the fourth step surface 431 abuts against the third step surface 133.
The mounting hole is composed of a matching part 131, a containing part 132 and a third step surface 133, preferably, a mandrel 40 at the position where the taper hole 41 is located (i.e. the position where the head end of the mandrel 40 is located) is attached to the matching part 131, and the mandrel 40 slides along the matching part 131 when moving back and forth; preferably, a fourth step surface 431 corresponding to the third step surface 133 is provided on the peripheral side wall of the spindle 40, when the spindle 40 drives the center 70 to move outwards and to abut against the fourth step surface 431, the spindle 40 stops moving, and when the first screw 21 drives the first driving nut 24 to move reversely, the spindle 40 moves reversely and is separated from the third step surface 133 under the action of the first driving nut 24 and the spring 25.
Further, an oil outlet cavity 52 is formed by surrounding the mandrel 40 and the accommodating portion 132, an oil inlet cavity 51 is formed by surrounding the tail end of the mandrel 40 and the piston sleeve 23, a first oil path 161 communicated with the oil inlet cavity 51 is formed on the piston sleeve 23, and a second oil path 162 communicated with the oil outlet cavity 52 is formed on the body 10.
It should be noted that, in this embodiment, the accommodating portion 132 is preferably a mounting hole near the piston sleeve 23, the end of the mandrel 40 is attached to the accommodating portion 132, the oil outlet cavity 52 is preferably formed between the mandrel 40 and the accommodating portion 132, the oil inlet cavity 51 is preferably formed between the piston sleeve 23 and the end of the mandrel 40, and the position of the center 70 can be adjusted by hydraulic control.
Specifically, hydraulic oil is input from the first oil path 161 towards the oil inlet cavity 51, the mandrel 40 is driven to drive the center 70 to move outwards under the action of the oil pressure, the oil in the oil outlet cavity 52 is discharged, the volume is reduced, the distance of outwards moving the center 70 can be controlled according to the actual positioning requirement, when the fourth step surface 431 abuts against the third step surface 133, the extreme value of the adjustment of the center 70 is reached, and at the moment, the volume of the oil outlet cavity 52 reaches the minimum value.
After the workpiece is machined, oil is input into the oil outlet cavity 52 through the second oil way 162, the mandrel 40 is driven to drive the center 70 to move inwards under the action of oil pressure, at the moment, the oil in the oil inlet cavity 51 is discharged, the volume is reduced, and when the mandrel 40 approaches the piston sleeve 23 and enables the piston sleeve 23 to abut against the second step surface 422, the mandrel 40 stops moving, and at the moment, the volume of the oil inlet cavity 51 reaches the minimum value.
Preferably, the flat key 241 is embedded on the outer peripheral sidewall of the first driving nut 24, the inner wall of the piston sleeve 23 is further provided with a sliding groove 231 corresponding to the flat key 241, and the sliding groove 231 penetrates through the piston sleeve 23.
The arrangement of the flat key 241 and the chute 231 can give the guiding function to the first driving nut 24, and the flat key 241 and the chute 231 are matched to ensure that the first driving nut 24 stably moves along the piston sleeve 23, so as to ensure that the mandrel 40 stably moves.
Further, the top of the body 10 is embedded with a guiding post 17 extending into the mating portion 131, a guiding groove 432 corresponding to the guiding post 17 is formed on the peripheral sidewall of the mandrel 40, and the guiding groove 432 extends along the axial direction of the mandrel 40.
The arrangement of the guide post 17 and the guide groove 432 further provides a guide effect for the movement of the mandrel 40, so that the mandrel 40 is ensured to move accurately, and the deviation is avoided.
It should be noted that, between the mandrel 40, the piston sleeve 23 and the whole mounting hole, sealing rings are arranged at any two mutually matched positions, so that oil is prevented from leaking outwards from the oil inlet cavity 51 or the oil outlet cavity 52, and the normal working state of all the components is ensured.
As shown in fig. 1, 2 and 7, preferably, the body 10 is further perforated with a through hole 14 parallel to the mounting hole, the through hole 14 is located below the mounting hole, a notch extending along the axial direction of the through hole 14 is formed on a side wall of the through hole 14, the notch horizontally passes through the body 10 outwards to form a gap 80, the gap 80 divides the body 10 into an upper portion 11 and a lower portion 12, and the second screw 31 passes through the gap 80.
In this embodiment, the body 10 is preferably divided into an upper portion 11 and a lower portion 12 by the through hole 14 and the opening of the slit 80, and the upper portion 11 and the lower portion 12 are still connected together on one side of the through hole 14 away from the slit 80, wherein the second screw 31 passes through the slit 80 to further connect the upper portion 11 and the lower portion 12, and when the scale hand wheel 32 is rotated, the second screw 31 can be driven to move down so as to drive the whole upper portion 11 to rotate along an arc track around the through hole 14 towards the lower portion 12, so as to achieve the fine adjustment effect on the tip 70.
Further, the body 10 is provided with an adjusting hole in a penetrating manner in a vertical direction, the second screw 31 is inserted into the adjusting hole, the adjusting hole is composed of an upper counterbore 151 and a lower counterbore 152, the upper counterbore 151 is located at the upper portion 11, and the lower counterbore 152 is located at the lower portion 12.
Preferably, the second screw 31 is arranged in the adjusting hole in a penetrating way, wherein the adjusting hole is composed of an upper counter bore 151 and a lower counter bore 152 which are respectively arranged on the upper part 11 and the lower part 12, the upper counter bore 151 and the lower counter bore 152 are coaxially arranged, and the second screw 31 sequentially penetrates through the upper counter bore 151 and the lower counter bore 152 from top to bottom.
Preferably, the top of the upper counterbore 151 is fixedly provided with a second driving nut 34, a part of the second driving nut 34 extends into the upper counterbore 151, the lower counterbore 152 is embedded with a supporting nut 33, the supporting nut 33 extends downwards out of the lower part 12 and is sleeved with a locking nut 35, the second screw 31 passes through the second driving nut 34 and extends into the supporting nut 33, the second screw 31 is respectively in threaded connection with the second driving nut 34 and the supporting nut 33, and the second screw 31 can be driven to move downwards until the scale hand wheel 32 abuts against the second driving nut 34 when the scale hand wheel 32 is rotated.
Specifically, it is preferable to insert the second driving nut 34 at the top of the upper counterbore 151, insert the supporting nut 33 at the position of the lower counterbore 152 near the gap 80, and connect the second screw 31 with the second driving nut 34 and the supporting nut 33 by screw threads, and rotate the scale hand wheel 32 to drive the second screw 31 to extend into the supporting nut 33 gradually downwards, the upper portion 11 rotates towards the lower portion 12 under the drive of the second screw 31, and in fact, rotates towards the lower portion 12 by taking the through hole 14 as a rotating shaft to make an arc track, so as to drive the center 70 to adjust the position. In this process, the scale hand wheel 32 moves down with the second screw 31, and when the scale hand wheel 32 abuts against the second drive nut 34, the movement stroke of the second screw 31 reaches the lower limit.
The lock nut 35 is configured to ensure that the second screw 31 and the support nut 33 are stably connected with the lower portion 12, so that the second screw 31 is convenient to move downwards, and stable adjustment is ensured.
It should be noted that the second screw 31 is provided with a driving thread and a supporting thread which are respectively corresponding to the second driving nut 34 and the supporting nut 33, and the pitch of the supporting thread is larger than that of the driving thread.
Specifically, the second screw 31 drives the upper portion 11 to rotate, which is actually achieved by setting threads with different pitches on the second screw 31, and in this embodiment, the pitch of the supporting thread is preferably larger than that of the driving thread, and the pitches on the second driving nut 34 and the supporting nut 33 which are matched with the second screw are correspondingly set.
Since the pitch of the support screw is greater than that of the drive screw, the second screw 31 is rotated by an angle during operation, the axial displacement amount generated on the support nut 33 is greater than that generated on the second drive nut 34, and a driving force is generated between the second drive nut 34 and the second screw 31, so that the upper portion 11 is driven to move downward.
Wherein a hole shoulder 341 is disposed in the second driving nut 34, the hole shoulder 341 is located above the driving thread, when the scale hand wheel 32 is reversely rotated, the scale hand wheel 32 can drive the second screw 31 to move upwards until the step where the driving thread is located abuts against the hole shoulder 341, at this time, the moving stroke of the second screw 31 reaches an upper limit, and the second screw 31 can move back and forth between the upper limit and a lower limit, thereby achieving the purpose of adjustment.
Further, a supporting seat 36 is sleeved on the second driving nut 34, the scale hand wheel 32 is partially embedded in the supporting seat 36, a plurality of scale marks 321 are uniformly distributed around the scale hand wheel 32, and a scale pointer 361 corresponding to the scale marks 321 is arranged on the supporting seat 36.
The supporting seat 36 is matched with the scale marks 321 on the scale hand wheel 32 through the scale pointer 361, so that an operator can conveniently adjust according to the scale marks 321 during adjustment, the fine adjustment degree of the center 70 can be conveniently controlled, and the use effect is good.
It should be noted that in this embodiment, the driving hand wheel 22 and the scale hand wheel 32 are preferably fixedly connected with the corresponding screw rods through set screws, so that the connection between each hand wheel and the corresponding screw rod is facilitated, the corresponding screw rod is driven to act when the hand wheel rotates, and the number of the set screws is selected according to actual needs, which is not limited herein.
As shown in fig. 2 and 9, preferably, the distance between the axis line of the adjustment hole and the axis line of the through hole 14 in the horizontal direction is L1, the distance between the axis line of the through hole 14 and the axis line of the tip 70 in the vertical direction is L2, and L1> L2.
In this embodiment, the horizontal distance from the through hole 14 to the adjusting hole is L1, the vertical distance from the through hole 14 to the axis of the tip 70 is L2, the second screw 31 at the adjusting hole drives the upper portion 11 to rotate around the through hole 14 toward the lower portion 12 in a circular arc track, the tip 70 shifts along with the upper portion 11, the displacement of the tip 70 in the horizontal direction is X2, and the displacement of the second screw 31 in the vertical direction is X1 when the second screw 31 drives the upper portion 11 to move downward.
Here, it is preferable that L1> L2, since the rotation angle is the same, the displacement X1> X2 is generated, and the degree of horizontal displacement of the tip 70 caused when the second screw 31 moves the upper portion 11 downward is reduced, thereby achieving a fine adjustment function of the position of the tip 70.
As shown in fig. 1, 2 and 8, further, one side of the bottom of the body 10 extends downward to form a supporting edge 18, two symmetrically arranged threaded sleeves 61 are embedded above the supporting edge 18, two locking bolts 62 corresponding to the two threaded sleeves 61 one by one are arranged on the other side of the bottom, movable wedges 63 are sleeved on the locking bolts 62, and a clamping space is formed between the movable wedges 63 and the supporting edge 18.
In order to facilitate the change of the position of the body 10 on the machine tool, the body 10 is clamped on the machine tool through the clamping space formed between the bearing edge 18 and the movable wedge 63, and meanwhile, the size of the clamping space can be changed by adjusting the position of the movable wedge 63, so that the adjustment is facilitated, and the bearing edge 18, the movable wedge 63 and the like are actually positioned at the lower part 12 of the body 10.
The movable wedge 63 is sleeved on the locking bolt 62, and the threaded sleeve 61 and the locking bolt 62 cooperate to facilitate the installation of the movable wedge 63 and the later disassembly and maintenance. In this embodiment, the number of the locking bolts 62 and the threaded sleeves 61 is preferably two, and the locking bolts and the threaded sleeves are symmetrically arranged on the lower portion 12 to ensure stability. The two movable wedges 63 may be respectively matched with the locking bolts 62, or may be integrally formed, and the two locking bolts 62 are all inserted into the movable wedges 63, which may be selected according to actual needs, and are not limited herein.
Preferably, the head of the locking bolt 62 is embedded in the corresponding threaded sleeve 61 and is in threaded connection with the corresponding threaded sleeve, the tail of the locking bolt 62 is sleeved with a top sleeve 621, and the top sleeve 621 abuts against the corresponding movable wedge 63. The position of the movable wedge 63 can be limited by the arrangement of the top sleeve 621, the adjusting range of the movable wedge 63 is limited, the limitation on the size of the clamping space is facilitated, the adjustment can be performed as required in actual working, and the practicability is good.
Further, as shown in fig. 3, a plurality of air floatation holes 19 are formed at the bottom of the body 10. The air floatation holes 19 are actually arranged at the lower part 12, gas can be introduced into the lower part 12 and conveyed outwards from the inside of each air floatation hole 19 during operation, the whole body 10 is suspended under the action of air flow, the installation position can be changed on a machine tool at will, and the gas input can be stopped after the position of the body 10 is determined.
The machine tool tailstock with the center driving and adjusting device is reasonable in structural design, and the center 70 is selectively and properly driven in a manual driving and hydraulic driving mode through the first screw rod 21, so that the machine tool tailstock with the center driving and adjusting device can be suitable for positioning different products, and is good in adaptability; the second screw 31 cooperates with the scale hand wheel 32 to realize the fine adjustment function of the position of the center 70; in addition, the installation position of the body 10 can be changed on the machine tool according to actual needs by the arrangement of the movable wedge 63, so that the adjustment is convenient, and the flexibility is good.
The preferred embodiments of the present invention are described herein, but the scope of the present invention is not limited thereto. Modifications, additions, or substitutions of the described embodiments by those skilled in the art are intended to be within the scope of the present invention.
Claims (6)
1. A machine tool tailstock with a center drive adjustment device, comprising:
the body is clamped on the machine tool, a mounting hole is horizontally formed in the body in a penetrating mode, one end of the mounting hole is covered with an end cover, the other end of the mounting hole is provided with a piston sleeve in a penetrating mode, the piston sleeve is tightly attached to the mounting hole, a mandrel is movably arranged in the mounting hole, the head end of the mandrel is embedded with a center, the center extends out of the end cover, and the piston sleeve part extends into the tail end of the mandrel;
the first screw rod is movably arranged in the piston sleeve in a penetrating way, a first driving nut positioned in the piston sleeve is sleeved on the first screw rod, the first screw rod extends out of the piston sleeve and is sleeved with a driving hand wheel, the first driving nut is connected with the mandrel through a spring, and the driving hand wheel can be rotated to drive the first screw rod to rotate so that the first driving nut moves towards the mandrel and pushes the mandrel and the center to move outwards through the spring;
the second screw rod penetrates through the body from top to bottom, a scale hand wheel is sleeved at the top of the second screw rod, and the second screw rod can be driven to rotate by rotating the scale hand wheel, so that part of the body drives the center to deviate;
the body is also provided with a through hole in a penetrating way, the through hole is arranged in parallel with the mounting hole and is positioned below the mounting hole, the side wall of the through hole is provided with a notch extending along the axial direction of the through hole, the notch horizontally passes through the body outwards to form a gap, the gap divides the body into an upper part and a lower part, and the second screw rod passes through the gap;
the body is provided with an adjusting hole in a penetrating manner in the vertical direction, the second screw rod is arranged in the adjusting hole in a penetrating manner, the adjusting hole is composed of an upper counter bore and a lower counter bore, the upper counter bore is positioned at the upper part, and the lower counter bore is positioned at the lower part;
the top of the upper counter bore is fixedly provided with a second drive nut, a second drive nut part extends into the upper counter bore, a support nut is embedded in the lower counter bore, the support nut extends downwards to the lower part and is sleeved with a lock nut, the second screw rod penetrates through the second drive nut and partially extends into the support nut, the second screw rod is respectively in threaded connection with the second drive nut and the support nut, and the second screw rod can be driven to move downwards until the scale hand wheel abuts against the second drive nut when the scale hand wheel is rotated;
two threaded sleeves which are symmetrically arranged are embedded above the bearing edge, two locking bolts which are in one-to-one correspondence with the two threaded sleeves are arranged on the other side of the bottom in a penetrating mode, movable wedges are sleeved on each locking bolt, and clamping spaces are formed between the movable wedges and the bearing edge in a surrounding mode.
2. The machine tool tailstock with the center driving and adjusting device according to claim 1, wherein a taper hole matched with the center is formed in the head end of the mandrel, a step hole which is coaxial with the taper hole and is mutually communicated is formed in the tail end of the mandrel, the step hole is provided with a first step surface and a second step surface, the second step surface is close to the piston sleeve, and the spring abuts against the first step surface.
3. The machine tool tailstock with the center driving and adjusting device according to claim 2, wherein a push rod is arranged in the first screw rod in a penetrating mode, the push rod is composed of a connecting portion and a guiding portion, the connecting portion is located in the first screw rod, and the guiding portion sequentially penetrates through the spring and the step hole and can partially extend into the taper hole.
4. A tailstock of a machine tool with a center driving and adjusting device according to claim 2 or 3, wherein the mounting hole comprises a matching part and a containing part, the matching part is connected with the containing part through a third step surface, the containing part is arranged close to the piston sleeve, a fourth step surface corresponding to the third step surface is arranged around the mandrel, and the mandrel can drive the center to move outwards until the fourth step surface abuts against the third step surface.
5. The tailstock with the center driving and adjusting device according to claim 4, wherein an oil outlet cavity is formed by surrounding between the mandrel and the accommodating part, an oil inlet cavity is formed by surrounding between the tail end of the mandrel and the piston sleeve, a first oil way communicated with the oil inlet cavity is formed on the piston sleeve, and a second oil way communicated with the oil outlet cavity is formed on the body.
6. The machine tool tailstock with the center drive adjusting device according to claim 1, wherein a flat key is embedded on the outer peripheral side wall of the first drive nut, a sliding groove which is arranged corresponding to the flat key is further formed in the inner wall of the piston sleeve, and the sliding groove penetrates through the piston sleeve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810651827.7A CN108856744B (en) | 2018-06-22 | 2018-06-22 | Machine tool tailstock with center driving and adjusting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810651827.7A CN108856744B (en) | 2018-06-22 | 2018-06-22 | Machine tool tailstock with center driving and adjusting device |
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| CN108856744A CN108856744A (en) | 2018-11-23 |
| CN108856744B true CN108856744B (en) | 2024-03-22 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107999795B (en) * | 2016-10-28 | 2021-07-20 | 富翔精密工业(昆山)有限公司 | Centre adjusting device |
| CN109834301A (en) * | 2019-04-22 | 2019-06-04 | 长江师范学院 | A kind of adjustable tailstock of bias |
| CN110860707B (en) * | 2019-11-29 | 2020-08-07 | 重庆宏钢数控机床有限公司 | Double-eccentric center type center |
| CN111590093B (en) * | 2020-04-30 | 2024-07-02 | 津上精密机床（浙江）有限公司 | High-precision and high-efficiency telescopic tailstock |
| CN113500520A (en) * | 2021-07-09 | 2021-10-15 | 陕西诺贝特自动化科技有限公司 | High-precision center fine-tuning grinding machine tailstock |
| CN113829108B (en) * | 2021-10-12 | 2022-12-20 | 北平机床(浙江)股份有限公司 | Precision driving mechanism for cutter machining |
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| WO2014069219A1 (en) * | 2012-10-30 | 2014-05-08 | 株式会社アマダマシンツール | Tailstock and working machine |
| CN204018737U (en) * | 2014-06-30 | 2014-12-17 | 浙江凯迪汽车部件工业有限公司 | With the lathe hydraulic tailstock of manual adjustments |
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| CN108856744A (en) | 2018-11-23 |
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